No there is no hindsight, it's just obvious. Your examples are not very good comparisons. We can't breath Martian air, temperatures are extreme, radiation, etc

No there is no hindsight, it's just obvious. Your examples are not very good comparisons. We can't breath Martian air, temperatures are extreme, radiation, etc, etc. This is vastly different from "Oh, that's a strange plant" or scurvy or whatever you're coming up with. Deep ocean exploration is an interesting point, we haven't really done much of that and I promise you Hernando Cortez didn't either. The fact is, comparison to early explorers is misplaced, at least as put in what I responded to. I mean it's sort of funny. The explorers were going places that humans already lives. The inhabitants were more impacted than the explorers. I can poke holes in this all day. No hindsight, just common sense. :)